This was the first exchange I knew and the truth seems to me to be a good service in general, the technical support is by email and in general it has seemed quite good.
I use this exchange regularly, the only detail I see is that the Dogecoins confirmations are somewhat slow and they ask for too many confirmations, also the BTC addresses cannot be traced from any BTC wallet analyzer (I have not tested with the rest of the currencies ), I assume they are private addresses.